[s1e12] M. Now

Known only as "M," the killer is a ruthless hitman who disguises his professional hits as the random acts of a serial killer, often leaving behind large pools of his victims' blood.

The episode moves away from the "case of the week" format and firmly establishes the series' overarching mythology. [S1E12] M.

This revelation leads Sherlock to the realization that Moran is just a "dragon" for a much more dangerous employer: the legendary Moriarty . Why This Episode Matters Known only as "M," the killer is a